基于模型定义和分类编码的飞机结构件数控编程技术研究

发布时间：2019-05-12 08:16

【摘要】：飞机结构件是构成飞机机体骨架和气动外形的重要零件,其种类繁多,功能重要。提高飞机结构件数控加工效率和加工质量,具有重要意义。特征编码技术和基于模型的定义技术可以提高飞机结构件数控加工编程化自动化水平,本文针对此方面开展研究。1、基于CATIA V5,构建飞机结构件MBD模型,模型包含了设计信息和工艺信息,基于MBD模型提出了飞机结构件机械加工工序模型的生成流程。2、提出基于图的飞机结构件特征识别方法。特征识别对于零件加工工艺路线决策和数控编程具有重要意义。首先得到飞机结构件的属性邻接图,去掉属性邻接图中所有代表凸边的点,得到全凹的邻接子图。再去掉邻接子图中代表毛坯面的结点,得到零件加工特征子图,将加工特征子图与预定义的特征子图匹配,实现飞机结构件特征识别。3、提出特征加工元的概念及加工元编码方法。将飞机结构件加工特征分解为独立的加工元,提出加工元编码系统的结构,将加工元分类并编码,制定加工元成组工艺。阐述加工元编码在飞机结构件设计生产中的意义,构建加工元信息模版并重点阐述加工元排序的目的和方法。从飞机结构件加工材料、加工方式、加工参数、机床和夹具和加工刀具等几方面分析了飞机结构件的加工工艺,引入非几何信息指导飞机结构件工艺决策,提出基于编码的飞机结构件数控加工工艺流程。4、基于CATIA V5,结合MBD技术和成组技术,应用CAA二次开发平台,开发飞机结构件数控加工系统。该系统由特征识别模块、CAPP工艺决策模块和数控编程模块组成。该系统的开发,能有效的实现飞机结构件工艺信息的提取,在一定程度上提高了飞机结构件工艺决策的能力,实现了飞机结构件数控加工的自动化。
[Abstract]:Aircraft structure is an important part of aircraft frame and pneumatic shape, which has many kinds and functions. It is of great significance to improve the NC machining efficiency and machining quality of aircraft structural components. Feature coding technology and model-based definition technology can improve the level of NC machining automation of aircraft structural parts. 1. Based on CATIA V5, the MBD model of aircraft structural parts is constructed. The model contains design information and process information. Based on MBD model, the generation flow of machining process model of aircraft structural parts is proposed. 2, the feature recognition method of aircraft structural parts based on graph is proposed. Feature recognition plays an important role in process route decision-making and NC programming of parts. Firstly, the attribute adjacent graph of the aircraft structure is obtained, and all the points representing the convex edge in the attribute adjacent graph are removed, and the fully concave adjacent subgraph is obtained. Then the node that represents the blank surface in the adjacent subgraph is dropped, and the machining feature subgraph of the part is obtained, and the machining feature subgraph is matched with the predefined feature subgraph to realize the feature recognition of aircraft structural parts. 3, The concept of feature machining element and the coding method of machining element are put forward. The machining features of aircraft structural parts are decomposed into independent machining elements, and the structure of machining element coding system is put forward. The machining elements are classified and encoded, and the processing element group technology is worked out. This paper expounds the significance of machining meta-coding in the design and production of aircraft structural parts, constructs the processing meta-information template, and focuses on the purpose and method of machining element sequencing. The processing technology of aircraft structural parts is analyzed from the aspects of processing materials, machining methods, machining parameters, machine tools, fixtures and machining tools, and non-geometric information is introduced to guide the process decision of aircraft structural parts. The NC machining process of aircraft structural parts based on coding is put forward. 4. Based on CATIA V5, combined with MBD technology and group technology, the NC machining system of aircraft structural parts is developed by using CAA secondary development platform. The system consists of feature recognition module, CAPP process decision module and NC programming module. The development of the system can effectively realize the extraction of process information of aircraft structural parts, improve the ability of process decision-making of aircraft structural parts to a certain extent, and realize the automation of NC machining of aircraft structural parts.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：V260.6

【参考文献】